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Хардкорная блоговая запись "CVE-2022-0185 - Winning a $31337 Bounty after Pwning Ubuntu and Escaping Google's KCTF Containers" еще один прекрасный пример (на ряду с CVE-2021-22555) побега из контейнера через kernel уязвимость хоста в рамках kCTF. Код эксплоита.

Основные моменты:
- Уязвимость позволяет в Kubernetes совершить побег из Pod на Host.
- Уязвимость появилась с 5.1-rc1 в марте 2019.
- Для атаки атакующий должен иметь доступ к контейнеру с CAP_SYS_ADMIN privileges (что само по себе считай побег) или к команде unshare(CLONE_NEWNS|CLONE_NEWUSER), которая даст CAP_SYS_ADMIN privileges в новом user namespace
- SeccompDefault в значении RuntimeDefault благодаря блокировке unshare способен замитигейтить данную багу (и все это только с 1.22)

Как и в прошлый раз я рекомендую: используйте AppArmor/SeLinux/seccomp профили для приложений, а также всегда имейте возможность смотреть что происходит внутри ваших контейнеров - прокачивайте observability.

Статьи по теме от вендоров [1,2].

k8s (in)security
Хардкорная блоговая запись "CVE-2022-0185 - Winning a $31337 Bounty after Pwning Ubuntu and Escaping Google's KCTF Containers" еще один прекрасный пример (на ряду с CVE-2021-22555) побега из контейнера через kernel уязвимость хоста в рамках kCTF. Код эксплоита.

Основные моменты:
- Уязвимость позволяет в Kubernetes совершить побег из Pod на Host.
- Уязвимость появилась с 5.1-rc1 в марте 2019.
- Для атаки атакующий должен иметь доступ к контейнеру с CAP_SYS_ADMIN privileges (что само по себе считай побег) или к команде unshare(CLONE_NEWNS|CLONE_NEWUSER), которая даст CAP_SYS_ADMIN privileges в новом user namespace
- SeccompDefault в значении RuntimeDefault благодаря блокировке unshare способен замитигейтить данную багу (и все это только с 1.22)

Как и в прошлый раз я рекомендую: используйте AppArmor/SeLinux/seccomp профили для приложений, а также всегда имейте возможность смотреть что происходит внутри ваших контейнеров - прокачивайте observability.

Статьи по теме от вендоров [1,2].
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Хардкорная блоговая запись "CVE-2022-0185 - Winning a $31337 Bounty after Pwning Ubuntu and Escaping Google's KCTF Containers" еще один прекрасный пример (на ряду с CVE-2021-22555) побега из контейнера через kernel уязвимость хоста в рамках kCTF. Код эксплоита.

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